Knockdown form for molding concrete



Sept. 7 1926.

I w. E. BAUMBERGER KNOCKDOWN FORM FOR HOLDING CONCRETE Filed Nov. 9,1525 2 sheets-Shejepi m t a, @7 y V ail-02 72 Sept. 7 1926. v 1,599,035

w. E. BAUMBERGER KNOCKDOWN FORMIFOR MOLDING CONCRETE Filed Nov. 9, 192 2Sheets- Sheet 2 ing- "Additional objects and advantages Of- PatentedSept; 7, 1926;

i q to 1,599,035

vsmrr'rrin n satf imsnenn, or sanFRANcisoo, CALI ORNIA.

xnocxpowiv'ronn FORVMOLDING concan'rn Application filed-November 9,.1925. serial No. 67,834

: 'l hespresent invention relates to I knockdown fOlflIlSiOl moldingconcrete, especially for columns, beamaand the like,

- The: principal:objectfof the. invention is to provide aknock-'dowmform whichcan be used an indefinite numbeigof times, Afurtherobject is to providesuch a formv which is adjustable to differentsizes. Astill, fur:

therfobjectwi's to eliminate, to a large eX- tent,'the use.of bolts,nuts, or. other small special; fittings which are easily .lOSt. ;A

still further object is to provide a, form of ample strength-andrigidity to prevent bulgthe invention'will be apparent from thefollowingispecification, which mustbe read with the: understanding thatthe proportion, arrangement, and form of the several parts; may ,be.varied, within the limits of theclaims hereto appended, without depart--j 'ing from thespirit ofithe invention as set forth in said claims It isalsoto be, understood that, the invention, although particu-" .larlyadaptable for molding columns, beams 'andfthe like,'ma'y be, embodied in.forms of other shapes without material change,

With this in View, a preferred embodiment of the inventionwill'now befully described with reference toithev accompanyingdrawings, wherein:

Fig. 1 is an elevation of my complete form.;:- U

Fig. .2 is a longltudlnal 880131011 enlarged of oneof the corner channelmembers,'showing the splicing member for joining two units together, andis takenv onthehne 2 -2 -ofFig..3.w p H j Fig.3,is a transverse sectiontakenon the line,3.3"of Fig.2. I

iFig. 4j-is. atransverse section, enlarged,

of the complete form, and is taken on the line H of Fig. 5.

-: Fig,i..5i;is: a. side elevation of the"tra nsverse jointiibetween.two adjacent unitsrfl Fig. -6=.is"a: perspective detail of theoupperexample, thieeYsuch' units are shown in Fig. L'designated A, B, and*Crespectively. All are identical in construction,;and:. are-- built theform being up of four corner sections with intervening side sections,the transverse dimensions of governed bythe Width'o'f saidslde sectionsThe corner sections are all identical, and i x PATENT OFFICE.

each j comprises a longitudinally disposed channel member 1, Figsj l to7 preferably: iron orsteel, and positioned at an angle of degrees tovthe sides of the form, as

shown. To the sides ofthis channel memher are secured, as by nails 2,longitudinally. I

disposed flat, members 3, preferably Wood,

which complete the vcorner, section of the' unit. The edges of themembers 3 are out at anangle of 45 degrees, to abut against the sides ofthechannel member 1. Obviously, V a

if the cross section of" the column to be molded be otherthanrectangular, as for example hexagonal, the angular dimensions givenabove would be vari-edaccordingly.

The corner section isfurther held together and strengthened by gussets,there being preferably one such. gusset at each end of the section, andas many in betweenas ay;

benecessary. VThe end gussets only are showninthe drawings, however.Each gusset comprises an ang'ularly formed transversely disposed platemember-4, preferably iron or steel, provided with flanges 5 at its endregions, and said flanges are permanently secured to the backs of theflat members 3 by screws, rivets, or bolts indicatedv at 5, and atriangular flat plate 6 reinforcing the centralbent or, angular regionof said plate member 4 and secured thereto in any desired manner,not shown. The gussets thus constitute rlgid angular reinforcementsforthe corner sections, holding the membe s 1 and 3 together in thenproperrelative positions. Said gussets also provide flanges, extendingoutwardly from thecorner sections by which they may be connected;together, ,as will, be described hereinafter.

The intervening side sections, which are separable fromtthe corner sectons above described, are, longitudinallydisposed flat members 7preferably wood, and are fitted gto theycorner section members 3 bysplayed or rabbeted joints 8. Obviously one or more such'fiat membersmaybe used-to make up each side section- 7, or, in molding smallcolumns, the side sections may. be ensed with entirely. In moldinghorizontal cams,

the form or unit 'may consistonly of two n s c o as'sh s w o i a tainingbars 9, preferably metal. Said locking barsv are provided with suitableconnecting means which in their best form comprise angularly disposednotches 10 formed in the edges of said bars, the notches at the two endportions ot'each bar being reversed in direction, as shown. Thesenotches 10 register with apertures 11, Figs. 6 and 7, formed in thegusset members t and 6, there being preferably three such apertures ineach gus-' set, so that pins 12, Figs. 1 and 5, may be dropped throughto lock the bars 9 and the corner sections together. The side sections 7are retained in position by the splayed joints-S and by the bearing oftheir outer surfaces against the bars 9.

The angular arrangement ot' the notches 10 in the locking bars 9 makesfor ease in assembling the structure, without impairing the cfiect'iveness of the lock, for, the greater the lateral expansive forceupon the unit, the more securely are thepins 12 retained in saidnotches; and by providing a plurality of such notches in each bar, thesame bars may be used for units of different dimensions.

IVhen'two units are placed end to end, only one set of locking bars needbe used at the joint, said bars lying between the gussets of theadjacent units, as shown in Fig. 5, and

the pins 12 being passed through both gussets and the intervening-bar.Said gussets, pins, and bars thus serve to connect the two units, but asa further connection, and to add rigidity to the joint, I prefer toemploy the parts shown in Figs. 1, 2 and 3. These comprise splicing bars13 lying longitudinally within the channels 1 of the corner members andextending across the joints, and clamping screws 1% adapted to bear.against the outer faces of said splicing bars, said screws being mountedin bridges or yokes 15 secured to the open sides of the channel members.As a further precaution I prefer to provide the inner faces of the bars13 with teeth, as shown at 16, adapted to engage correspondinglytoothedblocks 17 secured to said channel members 1. Thus when two or more unitsarejoined together, end to end, both by the pins 12 and by theconnecting bars 13, a rigid columnar form is provided; j a

It will be obvious that the'splieing' bars 13 may be relied uponexclusively to make a rigid joint between adjacent units, especially incomparatively light work. This construction is indicated in Fig. 1', inwhich the units Band C are provided with gussets at 1,599,035 a W- ltheir upper ends only, their lower ends being held against lateralexpansion by being connected, through the agency of the bars 13, withthe gussets and transverse locking bars 12 of the upper ends of thesections A and B respectively. The use of the splicing bars 13 alsopermits the adjacent units to be spaced slightly, as shown at 17 in Fig.2, it such spacing be desired for any reason. In this case, the bars 13not only connect the adjacent units, but bear the weight of the upperunit as well. The teeth 16 prevent slipping, and provide for reasonablyclose adjustment of the space 17.

As a further means of strengthening the joints between the ends ofadjacent units, I may shift the side sections 7 longitudinally withrespect to the corner sections, so that the joints between the ends ofsaid side'sections are out of line with those of the corner sections, asindicated at 18 in Fig. 1. A

short filler piece 19 may be employed at the bottom of each tier of sidesections to produce such broken joints. The bottom of the complete formmay be secured in any desired manner to a suitable base indicated at 20.

In order to preserve the wooden members 3 and 7 from the deleteriouseffects of the concrete, I prefer to employ a lining 21, Fig. 4;, whichmay be made of any suitable material, as for example sheet metal, andwhich may be held in position by any suitable.

means not shown in the drawings. Such lining may have any desiredsurface form. For example, I have shown it as corrugated, to produce arough or corrugated surface upon the concrete for the better adhesion ofplaster or other coating subsequently applied.

It is to be noted that my form requires no bolts, screws, or otherspecial small parts capable of being lost easily, with the exception ofthe pins 12, and for these pins I prefer to use ordinary nails ofsuitable size. The clamping screws 1 1 are screwed through the yokes 15,and, if desired, some well known means may be employed for preventingtheir removal. All other parts are of such a size as to keep them frombeing easily lost or broken.

Having thus described my invention, what I claim as new and desire toprotect by Letters Patent ofthe United States is 1. In aknock-down formfor molding concrete, a corner section comprising a longitudinallydisposed channel member; flat members secured to the sides of saidchannel member and having their faces angularly disposed toward eachother; and a substantially transverse gusset secured to the backs ofsaid fiat members to hold them and said channel member in their relativepositions.

In a knock-down form for molding concrete, acorner section comprising anob.-

lique longitudinally disposed member; flat members secured to thesidesof said oblique member and having their faces angularly disposed towardthe face thereof; and a substantially transverse gusset secured to thebacks of said flat members to hold them and said oblique member in theirrelative positions.

3. In a knock-down form for molding concrete, a corner sectioncomprising lOIlglillldb nal mold members angularly disposed toward eachother, and a. substantially transverse gusset extending across the backsof said members for holding them together, said gussetcomprising anangular member'bent at its central region and provided with flanges atits end regions for attachment to said mold members,and a triangularreinforcingplate secured'to the bent central region of saidangularmember.

crete, a corner section comprising anobliquelongitudinally disposedchannel member; flatmembeis secured to the sides of said channel memberand having their faces angularly disposed with respect to the facethereof; and means for holdingsaid channel member and said flat membersin their relative positions.

5. A knock-down form for molding concrete comprising a plurality ofcooperating corner sections having substantially transverse aperturedflanges pr0 ect1n g from their backs; a plurality of locking barssurround-v ing said corner sections, said bars'having inclined notchesin their edges adapted to register with the apertures of sa dfianges;and

connecting pins; removably seated said apertures and notches. I 1 I.

6. A knock-down form forvmolding concrete comprising a plurality ofcooperating corner sections having substantially transverse aperturedflanges projecting from their b cks; a locking bar extending acrossthebacks of said corner sections and lying adjacent the flanges thereof,said bar having 111- clined notches in its edge adapted to register withthe apertures of said flanges; and connecting pins removably .seated insaid apertures and notches.

l. In a knock-down form for molding con- 1 7. A knock-down form formolding concrete comprising a pair of corner sections;

gussets secured to the backs of said corner I ner sections eachcomprising an oblique longitudinally disposed channel member and flatmemberssecured to thesides of and angularly disposed toward said channelmember; means for releasably holding said corner sections together; andlining members within the form and positionedto cover the faces of saidflat members. I

9. In-aknock-down form for molding concrete columns and the like, aplurality of corner sections each comprising an oblique longitudinallydisposed channel member and flat members secured to the sides of andanber; means for releasably holding said corner sections together; andlining members provided with corrugated inner faces, positioned withinthe form and covering said fiat members.

10. In a knock down form for molding concrete, a pair of unitspositioned end to .end, each unit comprising longitudinally disposedcorner sections and intervening side sections, the o1nts between the adacent ends 7 of said side sections of the two units, lying ina differenttransverse plane from that of the joints between the adjacent ends ofsaid corner sections; means for separably con-- 'necting the sections ofone unit with those,

of the other unit; and transversely disposed means for separablyconnecting the sections of one unit together,

In testimony whereof I have signed my name to this specification.

WALTER E. BAUMBERGER.

gularly disposed toward said channel mem-

